There's new evidence, obtained by ABC, that the Obama administration did deliberately purge references to "terrorism" from accounts of the attack on the Benghazi diplomatic mission, which killed four people including the US ambassador to Libya.

A small team of Special Forces operatives was ready to fly from Tripoli to Benghazi last year after Libyan insurgents attacked the U.S. mission there, but was told it was not authorized to board the flight by regional military commanders, according to a career State Department official scheduled to testify before Congress on Wednesday.